Which of the following is an assumption made by the argument above?

A) Sales of the Hawaiian Burger would have been even higher had the burger included a slice of ham as well.
B) The Hawaiian Burger and the Mexican Burger have similar production costs.
C) There is no significant difference in the amount of training required to make the Hawaiian Burger as opposed to the Mexican Burger.
D) The Hawaiian Burger was the most popular burger sold at All American Burger during the time of the study.
E) There are no other important differences between the Hawaiian Burger and the Mexican Burger.

Answer: E
Explanation: E) The Hawaiian Burger sold more in City A than the Mexican Burger sold in City B. So demand for burgers with pineapple slices is greater than demand for burgers with jalapeno slices? There are a few holes in this argument, and Choice E points out one of them. The argument assumes that there are no other important differences between the burgers because if there were, then the higher sales of the Hawaiian Burger could have been due to one of those other differences instead of the pineapple/jalapeno difference. Choice A talks about ham. The argument makes no claims about ham, so nothing about ham need be assumed. Put another way, if adding the ham had no effect on sales, then the argument would not be damaged. Choice A, therefore, need not be assumed. Choice B is about production costs, which don't influence demand. Choice C is also about the cost to produce the service, which doesn't affect the demand for one product over the other. Choice D would strengthen the argument if it were true, but it does not need to be true in order for the argument to work. The argument doesn't claim that the Hawaiian Burger is more popular than all other burgers.